(Encyclopedia) compact disc (CD), a small plastic disc used for the storage of digital data. As originally developed for audio systems, the sound signal is sampled at a rate of 44,100 times a second…
(Encyclopedia) Clairton, city (2020 pop. 6,475), Allegheny co., SW Pa., an industrial suburb of Pittsburgh, on the Monongahela River; settled 1770, inc…
(Encyclopedia) KootenaiKootenaik&oomacr;ˈtĭnā [key], river, 407 mi (655 km) long, rising in the Rocky Mts., SE British Columbia, Canada. It flows S into NW Montana, NW through N Idaho, then N…
(Encyclopedia) Air Force, United States Department of the, military department within the U.S. Dept. of Defense (see Defense, United States Department of). The Air Force traces its roots to the…
(Encyclopedia) Ellesmere, Thomas Egerton, Baron, 1540?–1617, jurist and statesman. A distinguished early career at law brought him appointment (1581) as solicitor general, and he became a favorite…
(Encyclopedia) W and Z particles, elementary particles that mediate, or carry, the fundamental force associated with weak interactions. The discovery of the W and Z particles at CERN near Geneva,…
(Encyclopedia) South, the, region of the United States embracing the southeastern and south-central parts of the country. Traditionally, all states S of the Mason-Dixon Line and the Ohio River (…
